arch/s390/include/asm/atomic.h:51:35: sparse: sparse: context imbalance in 'btrfs_set_lock_blocking_read' - unexpected unlock

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3e08a95294a4fb3702bb3d35ed08028433c37fe6
commit: d6156218bec93965b6a43ba2686ad962ce77c854 btrfs: make locking assertion helpers static inline
date:   7 months ago
config: s390-randconfig-s031-20200623 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-dirty
        git checkout d6156218bec93965b6a43ba2686ad962ce77c854
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=s390 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


sparse warnings: (new ones prefixed by >>)

>> arch/s390/include/asm/atomic.h:51:35: sparse: sparse: context imbalance in 'btrfs_set_lock_blocking_read' - unexpected unlock
   fs/btrfs/locking.c:25:9: sparse: sparse: context imbalance in 'btrfs_set_lock_blocking_write' - unexpected unlock
   fs/btrfs/locking.c:127:6: sparse: sparse: context imbalance in 'btrfs_tree_read_lock' - different lock contexts for basic block
   fs/btrfs/locking.c:166:5: sparse: sparse: context imbalance in 'btrfs_tree_read_lock_atomic' - different lock contexts for basic block
   fs/btrfs/locking.c:186:5: sparse: sparse: context imbalance in 'btrfs_try_tree_read_lock' - different lock contexts for basic block
   fs/btrfs/locking.c:208:5: sparse: sparse: context imbalance in 'btrfs_try_tree_write_lock' - different lock contexts for basic block
>> arch/s390/include/asm/atomic.h:51:35: sparse: sparse: context imbalance in 'btrfs_tree_read_unlock' - unexpected unlock
   fs/btrfs/locking.c:19:9: sparse: sparse: context imbalance in 'btrfs_tree_lock' - wrong count at exit
   fs/btrfs/locking.c:25:9: sparse: sparse: context imbalance in 'btrfs_tree_unlock' - unexpected unlock

vim +/btrfs_set_lock_blocking_read +51 arch/s390/include/asm/atomic.h

56fefbbc3f13ad8 Peter Zijlstra     2016-04-18  46  
5692e4d11cf5b51 Heiko Carstens     2013-09-16  47  static inline void atomic_add(int i, atomic_t *v)
5692e4d11cf5b51 Heiko Carstens     2013-09-16  48  {
5692e4d11cf5b51 Heiko Carstens     2013-09-16  49  #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
5692e4d11cf5b51 Heiko Carstens     2013-09-16  50  	if (__builtin_constant_p(i) && (i > -129) && (i < 128)) {
126b30c3cb476ce Martin Schwidefsky 2016-11-11 @51  		__atomic_add_const(i, &v->counter);
0ccc8b7ac860533 Heiko Carstens     2014-03-20  52  		return;
5692e4d11cf5b51 Heiko Carstens     2013-09-16  53  	}
5692e4d11cf5b51 Heiko Carstens     2013-09-16  54  #endif
126b30c3cb476ce Martin Schwidefsky 2016-11-11  55  	__atomic_add(i, &v->counter);
5692e4d11cf5b51 Heiko Carstens     2013-09-16  56  }
5692e4d11cf5b51 Heiko Carstens     2013-09-16  57  

:::::: The code at line 51 was first introduced by commit
:::::: 126b30c3cb476ce68489a657a7defb8e73775e6f s390/atomic: refactor atomic primitives

:::::: TO: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
:::::: CC: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

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